The Bathroom Fan FAQ has some stuff on this
(http://pages.quicksilver.net.nz/geoffm/)
In short, use an inline fan, mounted as far as possible from the
inlet. mount it on wire or strapping. Use a GOOD quality fan, use a
big fan and speed control it down. use insulated ducting and a couple
of bends between the fan and the inlet and outlet. Look at using an
acoustic silencer.
It is easy enough to make a fan system so you can't hear it. It takes
space, time and some money - and attention to detail.
Geoff
--
"Peace through superior firepower"
"How to build a rolling road dyno", Radar detector FAQ and
Forte Agent automation FAQ both at http://www.bigfoot.com/~geoff_m
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